If the motor housing 5 is manufactured with a resin, the housing 5 becomes possible to be manufactured by injection molding, so that the housing 5 can be intended to lower the manufacturing cost by a mass production. Further, the counter measures for insulation such as covering a copper wire 7 with an insulating tape, interposing an insulator to an opening 5a of the housing installing an insulating shim between the coil 6a and the housing 5 become unnecessary. As a result, it becomes possible to expect a cost down of the spindle motor due to the reduction of the cost of the parts for insulating members and the mounting processes. And, further, since a vibration transmitted from the rotor 1 through the bearing and a vibration caused by an electric switching of the stator 6 etc. are diminished due to elastic absorbing function of the housing 5, rotation noise of the spindle motor can be reduced.
Legal claims defining the scope of protection, as filed with the USPTO.
1. A spindle motor for a disk driving device, comprising: a housing having a cylindrical projection portion formed therewith as a one-piece member; a stator comprising a stack and coils wound around the stack, the stator mounted on an outer circumference of the cylindrical projection portion of the housing to confront a magnet; a lead wire of the coils connected to an electric supplying connector portion; a rotor having a central hole and a downwardly depending flange at an outer periphery thereof, the rotor supported rotatably relative to the housing by a bearing means, the magnet disposed on an inner peripheral surface of the downwardly depending flange of the rotor, and a shaft fitted in the central hole of the rotor, wherein the bearing means is a pair of ball bearings, the ball bearings are disposed in the cylindrical projection portion of the housing with a spacer disposed between the bearings and the housing and the rotor are made of a super engineering plastic material and are unitarily formed by injection molding.
2. A spindle motor for a disk driving device according to claim 1 , wherein the super engineering plastic material is selected from liquid crystal polymer(LCP), polyphenylene sulfide(PPS), polyethersulfon(PES) and polysulfon(PSF).
3. A spindle motor for a disk driving device according to claim 1 , wherein the spacer is formed integrally with said housing.
4. A spindle motor for a disk driving device according to claim 1 , wherein the lead wire is connected to the electric supplying connector portion through a through-hole formed in the housing.
5. A spindle motor for a disk driving device according to claim 1 , wherein the electric supplying connector portion is molded with the housing in a unitary manner.
6. A spindle motor for a disk driving device according to claim 1 , wherein the lead wire is connected to a flexible printed circuit board (FPC).
7. A spindle motor for a disk driving device according to claim 1 , wherein the magnet is a rubber magnet.
8. A spindle motor for a disk driving device according to claim 1 , wherein the spindle motor is for a removal type of disk drive (ZIP).
Cooperative Patent Classification codes for this invention. Click any code to explore related patents in that topic.
January 20, 2000
March 30, 2004
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